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Contents
# frozen_string_literal: true
class Condenser::Cache
# Public: Basic in memory LRU cache.
#
# Assign the instance to the Environment#cache.
#
# environment.cache = Sprockets::Cache::MemoryStore.new(1000)
#
# See Also
#
# ActiveSupport::Cache::MemoryStore
#
class MemoryStore < Condenser::CacheStore
# Internal: Default key limit for store.
DEFAULT_MAX_SIZE = 33_554_432 # 32 Megabytes
PER_ENTRY_OVERHEAD = 240
def initialize(options = {})
@max_size = options[:size] || DEFAULT_MAX_SIZE
@cache = {}
@key_access = {}
@cache_size = 0
end
def clear
@cache.clear
@key_access.clear
@cache_size = 0
end
def get(key)
value = @cache[key]
@key_access[key] = Time.now.to_f if value
value
end
def cached_size(key, value)
key.to_s.bytesize + value.bytesize + PER_ENTRY_OVERHEAD
end
def set(key, value)
if old_value = @cache[key]
@cache_size -= (old_value.bytesize - value.bytesize)
else
@cache_size += cached_size(key, value)
end
@cache[key] = value
@key_access[key] = Time.now.to_f
prune if @cache_size > @max_size
value
end
def prune
keys = @key_access.keys.sort { |a, b| @key_access[a].to_f <=> @key_access[b].to_f }
keys.each do |key|
delete(key)
return if @cache_size <= @max_size
end
end
# Public: Pretty inspect
#
# Returns String.
def inspect
"#<#{self.class} size=#{@cache_size}/#{@max_size}>"
end
end
end
Version data entries
15 entries across 15 versions & 1 rubygems